System of applying alternating-current electrical energy.



PATENTED JUNE 5, 1906.

B. G. LAMME.

lNV NTOR ATTORNEY APPLICATION FILED SEPT. 22. 1904.

SYSTEM OF APPLYING ALTERNATING CURRENT ELECTRICAL ENERGY.

UNITED sTApns PATENT OFFICE.

BENJAMIN G.;LAMME, OF rrrrsnune, PENNSYLVANIA, ASSIGNOR TQ- WESTINGHOUSE ELECTRIC a MANUFACTURING ooMPANY, A con.

PORATION OJ! PENNSYLVANIA.

' SYSTEM OF APPLYlNG ALTERNATING-CURRENT ELECTRICAL ENE RGY.

Specification of Letters Patent.

Patented June 5, 1906.

Application filed September 22, 1904. Serial No. 226,482-

State of Pennsylvania, have invented a new and useful Improvement in S stems of Applying Alternatin -Current lectrical Enor y, of which the ollowing is a specification.

y invention relates to systems of applying electrical energy to alternating-current translating devicessuch, for example, as railway-motors.

My invention has for its object to rovide means for equalizing the differences 0 potential between terminals of twoor more seriesconnected motors, motor-armatures, or other translatin devices.

- It has een proposed. to propel railwayvehicles by means of alternating-current electric motors of the commutator type hav-- ing their armature and field-magnet windings connected in series relation. and it has been found that when two or more such mo-' tors are mounted upon the same car it is often desirable to connect all of the fieldmagnet windings either in series or in seriesparallel relation and to also connect the armature-windings either in series or seriesparallel relation andto reverse the direction of the current or the direction of the drop of potential through the one or the other of the eld-magnet and armature windings for the pur ose of reversing the direction of rotation. f t e motors are geared to difierent drivin axles, it is extremely desirable to rovi e means for equalizing the potential di erences between the terminals of the armature-windings, for the reason that if one pair of wheels should slip the counter electromotive force of the motor which is cared to the axle of that pair'oi wheels Won (1 rise until substantially the full potential difference across the terminals of both or all of the motors would be applied across the terminals of the other motor or motors tential might become dangerous to the insulation, and the speed of the motor-armature that is geared to the axle of the slippingwheels might become so high as to cause damage.

The single figure of the accompanying drawing is a diagram of a system which embodies my invention.

This abnormal rise of po- Alternating-current electrical ener y is supplied from a trolley 1 and a track-rai 2 to an autotransformer-winding 3, the terminals of which may be respectively connected to the rimary winding4 of a suitable voltagereg ator 5 and to corresponding terminals of two of the armature-windings 6 of the motors 7.

An intermediate point 8 of'the aut'otransformer-Winding 3 is connected to one terminal of secondary winding 9 of the voltagereg'ulator 5, the other terminal of the said Windingbeing connected to one terminal of the primary winding 4 of'the regulator and to terminal 10 of a reversing-switch 11. Terminal 12 of the reversing-switch 11 is connected to corresponding terminals of two of the armature-windings 6. The field-magnet windings 13 of the motors 7 are connected in series-parallel relation between terminals 14 and 15 of the reversing-switch.

As here indicated, four motors 7 are employed, the armature-windings 6 of which are connected together in series-parallel relation and the field-magnet windings of which are connected together in a similar relation,-

though it is to be understood that any other number of motors may be em loyed; that the field-magnet windings may e connected together in any other suitable relation, and that the armature-windings may be connected together all in series, if desired.

In order to equalize the differences of potential between the terminals of the respective motor-armatures, an autotransformerwinding 16' is connected between the outer terminals of the armatures and an intermediate point 17 is connected to the points 1-8 or to the armature-windings termmals which are connected together.

Since the diiierences of potential between r the point 17 and the terminals of the winding 16 have a fixed ratio, the differences of potential between the points 18 and the outer terminals of the armature-windin s 6 have also a fixed ratio, and conse uent y none of the armatures can attain suc a speed as to generate a counter electromotive force greater than the difference of potential between the terminals of the corres onding portion of the autotransformer-win ing. Since the motors will usually be similar in all res ects, the point 17 will ordinarily be locate midway between theterfmineis of the 1 w. l 16. end the difierences of potential between the termir eleof the respectivemotore willhemeinteinede uel. 5- We armature windings as connected in specific relations to each other end in e specific, errengement as regards the-reweIdeg-ewitch,

it is to be understood that these connections:

m are celyiilustretiye end that my i yemticeie not limited to such arrangements.

The operation of the invention remains the eeme Whether two or more niotor-ermetures ereconnected in series or in en symmetrical r 5 v series-parallel: arrangement, if cede from the .eutotrehsformerewinding are connectedito the P 'OP poi m e e, hQinve ic my be utilized in connectiqn wi th translat H 0 ere, provi thevoitegeieof such vehie ee maybe safe y eppiiedl' to. the voltegeregw. ieftiu g-device; o I V Q the translating, devices '..directiy between heve shown the field megnet-ehd eeiete It meyocceeionellybe convenient to omit the voltage-regulating device end to connect 35 leads fromthe mein'trensformer-winding; in Whicheeee the termihel'eef the eeiddevices ,which are connected;v together. may be connected to a point inthe eeid wielding that is intermediate the mid Reeds. o

- I chimes my invention 1 LEM-combination with e eoercecf altermating-current electrical energiy and two or more motors having seriesare lel connected field-magnet wind hgs. en series-connected 4 5 arma ur -.Win ng vf zmeene f r equalizing the potentieidifierencee between the termilne s of th eeul. emetu mndmg Z z'Ehe cembm. ionw heeeereeof. altermt egw r eut. elec ri al --ien r and. tw -er moremotorshavingseries: my elwconnected fi l -megn Windingsen eer e econnected .er e -w n icg o a tran former-mad ah v ngt onn c ions to the oute rm -,ne 5 .of the 1 ermetmre-windingeend, ,an intermediate connection to the armature-Winding term n which a onn t dtegetheri 1 Inteetimony whereof I havehereunto. subscri ed my am this w 'deyefseptemb 

